Merry Christmas, Josh!

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Across
  1. 6. Large marsupial
  2. 7. planet closest to the sun
  3. 8. A mammal that lays eggs
  4. 9. Flying mammal
  5. 10. The largest moon of Saturn, it has rivers and lakes of liquid farts carved through its surface
  6. 11. was stripped of its title in 2006; now a dwarf planet
Down
  1. 1. This planet orbits sideways
  2. 2. slugs have this many noses
  3. 3. 1 Down can't perform this bodily function
  4. 4. this mammal poops cubes
  5. 5. the largest known volcano, Olympus Mons, is on this planet
  6. 8. Josh's Christmas present